Sony MDRAS800BT Active Sports Bluetooth Headset (White) Bluetooth audio streaming with AAC and apt-X support, 2-way wearing style: secure or easy fit, Splash-resistant design prevents sweat from leaking in Hybrid silicone earbuds and Arc supporters provide a precise fit, Ultra-compact one-button design for simple operation, Built-in microphone for hands-free phone calling Rechargeable battery for up to 4.5 hrs. music playback, Convenient One-touch Connection (NFC), Carrying Case, USB charging cable, and Adjustment Band supplied Connectivity technology: Bluetooth, NFC Connectivity technology: Bluetooth, NFC